Switching the "To be translated" and the "Translated" boxes only switches the "Translated" box to the appropriate language, but does not change the "To be translated" language, or the text in the box (which Google Translate does). This is relatively minor but is a simple code adjustment which will improve your Interface. Other than that, good job! It is free and your UI it very clean.
Some backend issues here, but the best workaround is to use the homepage instead of one of our quicklinks pages: www.freetranslation.com